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Caernarfon Castle – The Cob Causeway loop from Talsarnau

Caernarfon Castle – The Cob Causeway loop from Talsarnau

Hard

riders

Caernarfon Castle – The Cob Causeway loop from Talsarnau

04:11

92.9km

940m

Road cycling

Hard road ride. Very good fitness required. Mostly well-paved surfaces and easy to ride. The starting point of the route is accessible with public transport.

Last updated: April 25, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Gwarchodfa Natur Genedlaethol Yr Wyddfa

Parc Cenedlaethol Eryri

Waypoints

Start point

Train Station

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10.8 km

Caer Fedw

Forest

13.9 km

Pont Aberglaslyn

Highlight • Viewpoint

The bridge was probably built in the 17th century and then radically rebuilt and widened in 1795-1796. As with many older bridges, folk tales claimed that the bridge was built …

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13.9 km

Stone Bridge over Afon Glaslyn

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The old bridge over the river or Afon Glaslyn is a great place to pause and watch the water go by. You can see down into the Aberglaslyn gorge with …

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19.3 km

Coed Pant-agored

Forest

19.8 km

Beautiful views across Llyn Dinas from the A498. Snowdon is to the north and the Watkin path starts a little further northeast up the road. Views south up onto Mynydd Llyndy which is managed by the National Trust.

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24.2 km

Pen-y-Pass Ascent from Nant Gwynant

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Voted one of the ten most iconic climbs in Wales, you have to conquer this climb. It climbs gently enough from Nant Gwynant to the summit of Pen y Pass for approximately 6km.

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30.0 km

Pen-y-Pass

Mountain Pass

30.1 km

Llanberis Pass – Pen-y-Pass Climb

Highlight (Segment) • Climb

Awesome mountain road from Nant Peris in the west to the top of Pen-y-pass in the east. It's a long climb up from Nant Peris or an exciting descent in …

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39.3 km

View of Llyn Peris

Highlight (Segment) • Viewpoint

51.3 km

Caernarfon Castle

Highlight • Monument

Royal fortress-palace built on legends and bitter medieval conflict Caernarfon Castle is recognised around the world as one of the greatest buildings of the middle ages

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83.9 km

The Cob Causeway

Highlight (Segment) • Bridge

This mile-long causeway crosses River Glaslyn as it reaches the estuary. Opened in 1811, this causeway carries the Ffestiniog Railway as well as an A road and a cycle path. …

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92.9 km

End point

Train Station

Way Types & Surfaces

Way Types

53.0 km

27.8 km

10.1 km

1.98 km

< 100 m

Surfaces

90.5 km

2.36 km

153 m

< 100 m

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (360 m)

Lowest point (0 m)

Weather

Thursday 7 May

16°C

3°C

34 %

Additional weather tips

Max wind speed: 12.0 km/h

to get more detailed weather forecasts along your route

Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.

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Caernarfon Castle – The Cob Causeway loop from Talsarnau

Pont Aberglaslyn

Stone Bridge over Afon Glaslyn

Llyn Dinas

Pen-y-Pass Ascent from Nant Gwynant

Llanberis Pass – Pen-y-Pass Climb

View of Llyn Peris

Caernarfon Castle

The Cob Causeway

Nearby routes

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